Feature/simplify split algn

[creisle]

No functionality changes

• moved top-level modules only used by validate into the validate subpackage
• cleaned up some overly verbose tests to use parametrize for the different test cases
• renamed SplitAlignment to DiscontinuousAlignment in prep for long-read changes

[codecov[bot]]

Codecov Report

Merging #330 (9027aa9) into develop_v3 (ad56ca3) will decrease coverage by 0.02%. The diff coverage is 97.22%.

@@              Coverage Diff               @@
##           develop_v3     #330      +/-   ##
==============================================
- Coverage       86.47%   86.45%   -0.03%     
==============================================
  Files              56       56              
  Lines            9315     9315              
  Branches         2404     2404              
==============================================
- Hits             8055     8053       -2     
- Misses            778      779       +1     
- Partials          482      483       +1     

Flag	Coverage Δ
unittests	86.45% <97.22%> (-0.03%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/mavis/validate/align.py	84.81% <91.66%> (ø)
src/mavis/main.py	89.39% <100.00%> (ø)
src/mavis/validate/assemble.py	90.28% <100.00%> (ø)
src/mavis/validate/base.py	78.07% <100.00%> (ø)
src/mavis/validate/blat.py	85.45% <100.00%> (ø)
src/mavis/validate/call.py	87.16% <100.00%> (ø)
src/mavis/validate/main.py	90.53% <100.00%> (ø)
src/mavis/breakpoint.py	90.61% <0.00%> (-0.65%)	:arrow_down:

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